PDF malware analysis — malicious · 334a2673ec289648

MALICIOUS

PDF

16.2 KB

MD5: 422174b696b6d8b651d455faf8becb8e SHA-1: d78350469c5429af6cb6ffe5f64e1ed2daae216b SHA-256: 334a2673ec2896488be723269adb7590a001a6cb0b07213682e9f172ffe8690c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains heavily obfuscated JavaScript, triggered by the CVE-2009-4324 vulnerability related to media.newPlayer. Static analysis recovered multiple embedded JavaScript streams, with the highest confidence heuristic indicating the use of eval() and unescape() for code execution. The deobfuscated JavaScript likely downloads and executes a second-stage payload, as suggested by the presence of multiple JavaScript streams and the CVE exploit trigger. The reconstructed string literals within the obfuscated JavaScript, such as 'eval()' and 'unescape()', are critical indicators of the execution method.

Heuristics 5

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `9673bc5f819adbcbdedd813ad2b88760303798f986396d882aae1ada7c64b88d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `e23d364b8bb8d256e97c38dfa8f226e8fa8f17798ace5fdc06b38b133a8c9da1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE7E	10338 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `a061fbff1ba1512069a7e010461b99e383ba98724a2e4ac9a7b2305d1926e962`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3716	2433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `6c3d7a10232e9eafa804abe6084cfff4463ce7f7bf8dd7b24859a01b87130923`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0xE7E	9810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 25 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `3af672dfcc1afa5bf58c9f0f873abaa25352c06c31913820aee3811b939271af`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE7E	1074 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `24711db1d0455a07499fb94e31b4cc2c0f70d1085202b3d69fa8b5914a3fc711`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3716	167 bytes
`legacy_pdfkit_stage_003.js` `9c4bb81d7cef21d537d220d41ed85d575d669b6e4aa1c5ca3e69b8f732de0d8e`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE7E	1242 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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